221421255544786 has 32 divisors (see below), whose sum is σ = 374039586349056. Its totient is φ = 97392616266000.

The previous prime is 221421255544717. The next prime is 221421255544787. The reversal of 221421255544786 is 687445552124122.

It is a self number, because there is not a number n which added to its sum of digits gives 221421255544786.

It is not an unprimeable number, because it can be changed into a prime (221421255544787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1436170 + ... + 21092773.

It is an arithmetic number, because the mean of its divisors is an integer number (11688737073408).

Almost surely, 2^{221421255544786} is an apocalyptic number.

221421255544786 is a deficient number, since it is larger than the sum of its proper divisors (152618330804270).

221421255544786 is a wasteful number, since it uses less digits than its factorization.

221421255544786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22543398.

The product of its digits is 43008000, while the sum is 58.

The spelling of 221421255544786 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-five million, five hundred forty-four thousand, seven hundred eighty-six".